Widening and Boxing Java primitives

Question

Widening and Boxing Java primitives.

I know it is not possible to widen a wrapper class from one to another as they are not from the same inheritence tree. Why thou

Answer 1

Why? Because boxing / autoboxing is only some compiler sugar and not a new type system. It's badly designed and causes trouble at least as often as it simplifies things.

But here are some workarounds for your compile error:

goInteger((int) b);

// these are equivalent
goInteger(((Byte) b).intValue());
goInteger(Byte.valueOf(b).intValue());